Pump for injection engines



March 8, 1938. R. WISNER 2,110,314

PUMP FOR INJECTION ENGINES Filed Nov. 29, 1935 2 Sheets Sheet l Ill/1111i) .lk

2 Mlswer -MQ I March 8, 1938. R. wlsNER PUMP FOR INJECTION ENGINES 2 SheetsSheet 2 Filed Nov. 29. 1955 pump d s e at d' y t the output or r 4 and the movement of the pull member 3 is thus Patented 's, 1938 I 2,110,314 I UNITED STATES PATENT OFFICE rum FOR. INJECTION ENGlNES Ren Wisner, Paris, France, assignor to Socit Anonyme Andr Citroen, Paris, France,

Application November 29, 1935, Serial No. 52,221

' France December 3, 1934 3 Claims..- (Cl. 103.41)

This invention relates to improvements in cylinderf2l during longitudinal movement of'the pumps for injecting liquid fuel into internal com-1 pull member 3 and thereby varies the angular bustion engines of the type in which the quantity position of the inclined wall 23 to one of the of fuel injected into each cylinder of the engine inlet ports 24.

for one stroke of the corresponding piston of the The pull member 3 is normally urged tothe feed pump is controlled by a pull member. Orleft by a spring; not shown, and ordinarily a dinarily the pull member whether operated manfixed stop is provided for limiting the movement ually or automatically to control the output of of the member 3 and thereby limiting the extent the pump is associated with a fixed stop against of turning movement of the'piston 22 to deterwhich the pull member is constantly urged in mine the maximum output of the pump for nor- 10 the direction to adjust the pump for increased mal running conditions of the engine. output. According to, the present invention, the usual If the fixed stop is positioned to limit the movefixed stop is dispensed with and a movable stop g, mer t oi the pull member to the position of maxi- 4 member I is positioned in the guide I for the pull mum output of the pump for normal operation member 3. The stop member 1 is provided with 15 of the engine at full power, difficulty is frequenta threaded stem 6 slidably'mounted in a support 1y experienced in starting the engine. 4 rigidly connected with the guide I. A spring The object of the present invention is tdpr'o- 5 arranged about the stem 6 is confined between vide a regulating device by which the stop memthe support '4 and the stop member I and -norher may be manually displaced beyond its posimally urges the latter to the right in opposition 20 tion of normal maximum output of the pump so tothe action of the spring, not shown, acting as to afford a rich fuel mixture suitable for quickupon the pull member 3. The normal position ly starting the engine. e of the stop member 1 is determined by a stop nut In the accompanying drawings wherein an ap- 8 fitted onthe-threaded end of the stem 6 and proved embodiment of the invention is illusengageable with the terminal of the support 4,

trated:- Y a lock nut 9 being provided to secure the stop Figure 1 is an elevation of a pump partly in nut in adjusted position. a

section and showing the application of the in- The extreme end of the stem'B is provided with vention thereto, the regulating device occupying a pin l0 engaging ina-slot ll of a lever l2 pivits norm posi ion i w i t mum qua otally mounted at 13 on an arm I: oLthe-suptity of fuel necess'ary for normal operation of the port 4. The end l5- of the lever 12 is adapted engine at all working speedsis supplied. to be connected by a suitable operating .device,

Fig. 2 is a view similar to Fig. 1 showing the not shown, located conveniently near the operregulating device adjusted to increase the outator-of the engine, the operatingdevicebeing put of the pump to facilitate starting of the encapable of retaining the lever 12 in several dif- 35 gine. v ferent positions of adjustment.

Fig. 3 is a section on the line 37-3 of Fig. 1. As shown in Fig. 1, the stop member 1 is moved Referring to the drawings in detail, t e mlto the right-under the influence of the spring 5 meral 2| indicates one of the cylinders of the until the stop nut 8 tests against the support which is controlled by a pull member 3 in the limited for the adjustment of the pistons 22 for form of a rack connected with the accelerating the normal operation of the engine. -With this pedal of the engine or a regulator which latter adjustment the eflective stroke of the piston is is not shown but is well known in the art. A designated A in Fig. 1. When it is desired to piston 22 is-mounted in each cylinder 2| and is supply a rich fuel mixturefor the purpose of 45 adapted during reciprocation to cover and unstarting the engine, the lever I2 is moved to the cover the inlet ports 24 in the cylinder 2|. The position shown in Fig. 2 and the stop member 1' piston 22 is provided with a recess having an inis displaced to -'the left thereby permitting the clined wall 23 terminating in anaxial passage pull member 3 to follow the stop member and ad- 26 adapted to establish communication between just the pistons" to the position to increase the 50 one of the inlet ports 24 and the pressure chamefiective strokes as indicated at B in Fig. v2. ber 25 of the pump cylinder. The teeth otthe 'WhatI claim is: t 1 pull member 3 mesh with a toothed member 21 1. In a regulating device for a pump for inconnected with the piston 22 whereby the latter jecting liquid fuel ininternal combustion engines l v is turned about its longitudinal axis within the in which a sliding pull member is constantly m. .2 Em a x 3m 5...? rfmm mmr a In b mansion momma-Ill! theme! the magma: otthclwlnluul mind devloetorlmlorfi in: v v 

